"there are many working class people with high I.Q.s, and there are some middle class people with low I.Q.s. The overlap is greater in the lower social classes; it is easier to have a high I.Q. and lose out in the occupational stakes for reasons of bad luck, bad health, lack of persistence, or mental illness, than it is to get past the many hurdles, educational and otherwise, which bestrew the path to middle class success, with a low I.Q."

Hans J. Eysenck


"it is not nearly as difficult to find gifted children (IQs above 130) in the lower classes as it is to find mildly retarded children in the upper classes."

Arthur R. Jensen